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BEU05 - High Spatial Resolution Observations of NH3 and CH3OH toward the Massive Twin Cores NGC 6334I and NGC 6334I(N)

Interferometry data

Short title: Beuther et al. (2005)
Authors: Beuther, H. Thorwirth, S. Zhang, Q. Hunter, T. R. Megeath, S. T. Walsh, A. J. Menten, K. M.
Journal: The Astrophysical Journal, Volume 627, Issue 2, pp. 834-844.
Bibcode:

Target type: UCHII
Transitions: CH3OH_9(I),CH3OH_25-30_GHz(I),CH3OH_84(I),CH3OH_95(I),CH3OH_104(I)

Abstract
Molecular line observations of NH₃ (J,K)=(1,1) and (2, 2) and CH₃OH at 24.93 GHz taken with the Australian Telescope Compact Array (ATCA) toward the massive twin cores NGC 6334I and NGC 6334I(N) reveal significant variations in the line emission between the two massive cores. The UC H II region/hot core NGC 6334I exhibits strong thermal NH₃ and CH₃OH emission adjacent to the UC H II region and coincident with two millimeter continuum peaks observed by T. R. Hunter et al. In contrast, we find neither compact NH₃ nor thermal CH₃OH line emission toward NGC 6334I(N). There the NH₃ emission is distributed over a broad region (>1') without a clear peak, and we find Class I CH₃OH maser emission with peak brightness temperatures up to 7000 K. The maser emission peaks appear to be spatially associated with the interfaces between the molecular outflows and the ambient dense gas. Peak NH₃ (1, 1) line brightness temperatures >=70 K in both regions indicate gas temperatures on the same order. NH₃ emission is also detected toward the outflow in NGC 6334I, resulting in an estimated rotational temperature of T_rot~19 K. Furthermore, we observe CH₃OH and NH₃ absorption toward the UC H II region the velocity structure is consistent with expanding molecular gas around the UC H II region. Thermal and kinematic effects possibly imposed from the UC H II region on the molecular core are also discussed. eprintid: arXiv:astro-ph/0504074

Abstract

Molecular line observations of NH₃ (J,K)=(1,1) and (2, 2) and CH₃OH at 24.93 GHz taken with the Australian Telescope Compact Array (ATCA) toward the massive twin cores NGC 6334I and NGC 6334I(N) reveal significant variations in the line emission between the two massive cores. The UC H II region/hot core NGC 6334I exhibits strong thermal NH₃ and CH₃OH emission adjacent to the UC H II region and coincident with two millimeter continuum peaks observed by T. R. Hunter et al. In contrast, we find neither compact NH₃ nor thermal CH₃OH line emission toward NGC 6334I(N). There the NH₃ emission is distributed over a broad region (>1') without a clear peak, and we find Class I CH₃OH maser emission with peak brightness temperatures up to 7000 K. The maser emission peaks appear to be spatially associated with the interfaces between the molecular outflows and the ambient dense gas. Peak NH₃ (1, 1) line brightness temperatures >=70 K in both regions indicate gas temperatures on the same order. NH₃ emission is also detected toward the outflow in NGC 6334I, resulting in an estimated rotational temperature of T_rot~19 K. Furthermore, we observe CH₃OH and NH₃ absorption toward the UC H II region the velocity structure is consistent with expanding molecular gas around the UC H II region. Thermal and kinematic effects possibly imposed from the UC H II region on the molecular core are also discussed. eprintid: arXiv:astro-ph/0504074

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Detection table from Beuther et al. (2005)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	V_peak	F_peak	∫F dv	Telescope	V_step	RMS	Beam	Detection	Class	Dist. (parallax)
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						CH₃OH (class I)	(km/s)	(Jy)	(Jy*km/s)		(km/s)	(mJy)	(arcsec)	Yes/No		(kpc)
1	+17 20 53.44	-35 47 2.2			351.416784	0.644896	G351.446+0.660		NGC 6334I	Image	Descr	24.928 GHz (I);	-5 .. -3	..	..	ATCA	0.2	6.000	130	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
	+17 20 55.68	-35 45 0.2	33598.8 mas	121998 mas	351.448944	0.657998		1	NGC 6334I				-3
	+17 20 55.03	-35 45 15	23848.8 mas	107198 mas	351.444313	0.657460		2	NGC 6334I				-5

Non-detection table from Beuther et al. (2005)